a middleware to validate express params on a route
npm install express-params-validatorbash
npm install express-params-validator
`
or
bash
yarn add express-params-validator
`Also make sure that you have Node.js 6 or newer in order to use it.
How to use
javascript
import { middleware } from 'express-params-validator';const paramValidator = (req, res, next) => {
const valid = middleware(req, res, next);
valid
.isEnum('type', ['email', 'number'])
.isUUID('id')
.isNumber('phone')
.check();
};
export { paramValidator };
`
then you can use it in the express router like this javascript
import express from 'express';
import message from '../controllers/message';
import { paramValidator } from '../middlewares/validator';const { getMessage } = message;
const router = express.Router();
router.post('/messag/:id/:type/:phone', paramValidator, getMessage);
export default router;
`
and get errors as
json
{
"errors": [
"id must be a UUID",
"phone must be a number",
"type must be be one of these: email,number"
],
"message": "Invalid Parameter(s)"
}
`To use custom error output
javascript
const paramValidator = (req, res, next, {
error: true,
message: 'there is an error',
data: {}
}) => {
const valid = middleware(req, res, next);
valid
.isEnum('type', ['email', 'number'])
.isUUID('id')
.isNumber('phone')
.check();
};`
and get an error similar to json
{
"error" : true,
"message": "there is an error",
"data": {"errors": [
"id must be a UUID",
"phone must be a number",
"type must be be one of these: email,number"
]
}
}
``